INTERESTING LOCALITIES OF THE WEWE SLATE. 273 



or greenish-gray to black. Many of them are, however, heavily ferrugi- 

 nous, and these are dark-red, bright-red, or Ijrown. In some cases the 

 amount of hematite is so considerable that test-pitting has been done. In 

 many of the coarser-grained black slates are seen numerous fragmental 

 jiarticles of mica, the leaflets being generally arranged parallel to the 

 bedding. Certain of the black slates have a carbonaceous appearance, 

 and in these is seen very abundant iron sulphide in innumerable small 

 crjstals. 



West of the exposures in this vicinity none are found along the Wewe 

 belt for 2 miles. In sees. 11 and 12, T. 47 N., R. 26 W. (Atlas Sheet 

 XXXI Y), however, occur typical exposures of the slate, separating the 

 Kona dolomite below and the Ajibik quartzite above, and thus showing 

 that the belt is persistent. 



Goose Lake. — Tlic ucxt exposures of the formation are those about Goose 

 Lake. The first locality which pi-esents exceptional interest is in the NE. \ 

 sec. 24 and the SE. i sec. 13, T. 47 N., R. 26 W. (Atlas Sheets XXXIV and 

 XXXV). At this place there are continuous exposures of the slate from 

 the Kona dolomite below to the Ajibik quartzite above. This exposure 

 has a large number of minor rolls, with strikes approximately east-west 

 or south of east, and with axes plunging to the east or south of east at 

 angles from. 10° to 20°. 



At the bottom of the formation, or at the top of the Kona dolomite, is a 

 chert and novaculite breccia, many of the chert fragments being rather well 

 rounded by movement. It was at first thought that this was a conglomerate, 

 and that possibly there was a break between the Kona dolomite and the 

 Wewe slate (PI. VII, fig. 2). This breccia grades up into interlaminated 

 fine-grained gray and felsitic-looking red novaculites and graywackes, these 

 into red and black slates, these into black slate, and this, by numerous inter- 

 stratifications, into the Ajibik quartzite. An estimate of the thickness of 

 the various beds between the Kona dolomite and the Ajibik quartzite is 

 as follows: Novaculite and graywacke, 30 to 50 feet; red and black slates, 

 25 feet; black slate, 10 feet; interstratifications of slate and quartzite, 15 

 feet; thus making a maximum thickness of 100 feet. On account of the 

 MON xxviii 18 



